*{
    margin: 0;
    padding: 0;
}
html,body {
    width: 100%;
    height: 100%;
}
body {
    background: url(../img/login-background.jpg);
}
.box {
    width: 500px;
    height: 400px;
    background-color: aliceblue;
    border: 1px solid white;
    border-radius: 20px;
    margin: 200px auto;
}
h2 {
    margin-top: 20px;
    text-align: center;
}
input {
    display: block;
    width: 300px;
    height: 30px;
    margin: 50px auto;
    border-radius: 5px;
    border: none;
    background-color: white;
}
button {
    width: 300px;
    height: 30px;
    background-color: blue;
    display: block;
    color: white;
    text-align: center;
    line-height: 30px;
    margin: auto;
}